Studies on Systemic Action of Neem Formulations in Rice

Based on bioassay results against brown plant hopper (BPH) and green leaf hopper (GLH) in green house studies, neem formulations with high azadirachtin content (10,000 ppm) have been demonstrated to possess upward translocation of active principles when given as seedling root dip in 100 to 300 ppm azadiiachtin sslutions. A six h seedling root did was as good as the 19h dip. Similar proof for downward translocation of neem active principles in rice seedllngs was obtained when the solution with 100 to 500 ppm azadirachtin were eprayed do leaves and bioassayed with BPH, GLH and white-backed planthopper (WBPH) nymphs, by confining them to bottom unsprayed portions of rice seedlings.